In Chicago Style, subsequent citations are formatted as shortened notes:
First Note:
2. Barbara Brooks Tomblin, The Civil War on the Mississippi: Union Sailors, Gunboat Captains, and the Campaign to Control the River (Lexington, Kentucky: The University Press of Kentucky, 2016), 15-24.
Shortened Notes:
7. Tomblin, Civil War on the Mississippi, 50.
8. Tomblin, 50.
9. Tomblin, 63-6.
First Note:
3. Mario Graca Moura and Antonio Almodovar, “Political Economy and the ‘Modern View’ as Reflected in the History of Economic Thought,” European Journal of the History of Economic Thought 23, no. 1 (February 2016): 61.
Shortened Notes:
5. Moura and Almodovar, “Political Economy,” 63.
6. Moura and Almodovar, 62-3.
First Note:
6. Scott Galloway, “How Amazon, Apple, Facebook and Google Manipulate our Emotions,” filmed October 2017 at TEDNYC, New York City, New York, video, 19:05, https://www.ted.com/talks/scott_galloway_how_amazon_apple_facebook_and_google_manipulate_our_emotions.
Shortened Notes:
9. Galloway, “Amazon, Apple, Facebook and Google.”
10. Galloway.
The 17th edition of the Chicago Manual of Style discourages the use of Ibid. Instead, the CMOS recommends the use of shortened citations (see the examples above). However, if your professor allows it, Ibid. is used:
10. Moura and Almodovar, “Political Economy,” 63.
11. Ibid.
12. Ibid., 62.
13. Tomblin, Civil War on the Mississippi, 50.
14. Ibid., 56-62.
15. Moura and Almodovar, “Political Economy,” 62-3.